Two towboats attached to a submarine flotilla with the navy under the PLA Northern Theater Command jointly tow a submarine off a dock during a maritime drill on torpedo attack and defense, submarine control, etc. on October 25, 2022. Photo:China Military

Two towboats attached to a submarine flotilla with the navy under the PLA Northern Theater Command jointly tow a submarine off a dock during a maritime drill on torpedo attack and defense, submarine control, etc. on October 25, 2022. Photo:China Military

Two towboats attached to a submarine flotilla with the navy under the PLA Northern Theater Command jointly tow a submarine off a dock during a maritime drill on torpedo attack and defense, submarine control, etc. on October 25, 2022. Photo:China Military

Two towboats attached to a submarine flotilla with the navy under the PLA Northern Theater Command jointly tow a submarine off a dock during a maritime drill on torpedo attack and defense, submarine control, etc. on October 25, 2022. Photo:China Military

A submarine attached to a submarine flotilla with the navy under the PLA Northern Theater Command steams in the sea during a maritime drill on torpedo attack and defense, submarine control, etc. on October 25, 2022. Photo:China Military